﻿//    Copyright 2014 LuoZhihui
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
//      http://www.apache.org/licenses/LICENSE-2.0
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.

#region 导入名称空间

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Autofac;
using LightWork.ServiceLocation;

#endregion

namespace LightWork.Autofac.CommonServiceLocator
{
    internal class AutofacServiceLocator : ServiceLocatorImplBase
    {
        private readonly IComponentContext _container;

        public AutofacServiceLocator(IComponentContext container)
        {
            if (container == null)
                throw new ArgumentNullException(nameof(container));
            _container = container;
        }

        protected override IEnumerable<object> DoGetAllInstances(Type serviceType)
        {
            if (serviceType == null)
                throw new ArgumentNullException(nameof(serviceType));
            var type = typeof(IEnumerable<>).MakeGenericType(serviceType);
            return ((IEnumerable) _container.Resolve(type)).Cast<object>();
        }

        protected override object DoGetInstance(Type serviceType, string key)
        {
            if (serviceType == null)
                throw new ArgumentNullException(nameof(serviceType));
            if (key == null)
                return _container.Resolve(serviceType);
            return _container.ResolveNamed(key, serviceType);
        }
    }
}